Web site Mac OS X hints has an interesting tip for improving the performance of FM transmitter car…
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The basic idea here is that you can build a small FM transmitter for your MP3 player so you can send audio to pretty much any stereo. To do so, you'll just need a few off the shelf parts and a spare afternoon. Once you're done, you'll be able to amplify your transmitter so it can send your audio a little further, just make sure you don't accidentally break any laws when you do it. Sure, you can purchase one of these easily enough, but it's a solid project for helping you learn how they work so you can apply it elsewhere.